MPXM2102AS datasheet(610/670 Pages) MOTOROLA

610 / 670 page

MC14578

4–18

Motorola Sensor Device Data

www.motorola.com/semiconductors

IN +

BUFF OUT

Rbias

VSS

OUT C2

OUT A

OUT B

IN C

OUT C1

IN B

IN A

VDD

COMP OUT

MC14578

3.9 M

NOTE: IN + and IN

* have very high input impedance. Interconnect to these pins should be as short as possible.

Figure 1. Low–Battery Detector

V+

6.8 k

LOW–BATTERY

INDICATOR

OUTPUT

HIGH = BATTERY LOW

LOW = BATTERY OK

APPLICATIONS INFORMATION

EXAMPLE VALUES

Near the switchpoint, the comparator output in the circuit

of Figure 1 may chatter or oscillate. This oscillation appears

on the signal labelled OUTPUT. In some cases, the oscilla-

tion in the transition region will not cause problems. For

example, an MPU reading OUTPUT could sample the signal

two or three times to ensure a solid level is attained. But, in a

low battery detector, this probably is not necessary.

To eliminate comparator chatter, hysteresis can be added

as shown in Figure 2. The circuit of Figure 2 requires slightly

more operating current than the Figure 1 arrangement.

Nominal Trip Point

470 k

Ω

1.3 M

Ω

20 k

Ω

4.08 V

820 k

Ω

1.2 M

Ω

39 k

Ω

5.05 V

1.2 M

Ω

1.2 M

Ω

62 k

Ω

6.00 V

Figure 2. Adding Hysteresis

–

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MPXM2102AS Datasheet(PDF) 610 Page - Motorola, Inc

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